Magma, Types of Vulcanoes, ...

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Referat, Hausaufgabe, Magma, Types of Vulcanoes, ...
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Referat
Magma Composition ----------- Magma, then, is most likely neither uniform nor homogenous. Parts may be largely crystalline, while other parts are largely liquid. The chemical composition in different parts of a melt may also vary. Glassy volcanic rocks originate from magma that was probably a mixture of liquid and gas alone (see VOLCANO). Volcanologists analyzing gases escaping from volcanic vents can infer what gases might have escaped from magmas but not their amounts. Volcanic rocks with various proportions of crystals and glass suggest magmas containing many solids. The various lava types indicate a range of fluid to viscous magmas. Liquid and gas may contribute as little as 5 percent to the volume of some magmas. Chemically most magmas are rich in silicon dioxide and aluminum oxide ...

Autor:
Anzahl Wörter:
2016
Art:
Referat
Sprache:
Englisch
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